.icon {
  display:inline-block
}
.icon-twitter {
  background-image:url(../slice/icon-twitter.png);
}
.icon-github {
  background-image:url(../slice/icon-github.png);
}
.top-banner {
  display:block;
  background-image:url(../img/bg-logo.png);
  width:300px;
  height:300px;
}
